linux-kernel - Re: [PATCH] remoteproc: qcom: Introduce Hexagon V5 based WCSS driver

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Date:   Thu, 7 Jun 2018 15:02:12 +0530
From:   Sricharan R <sricharan@...eaurora.org>
To:     Vinod <vkoul@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     ohad@...ery.com, robh+dt@...nel.org, mark.rutland@....com,
        andy.gross@...aro.org, david.brown@...aro.org,
        linux-remoteproc@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-soc@...r.kernel.org, sibis@...eaurora.org
Subject: Re: [PATCH] remoteproc: qcom: Introduce Hexagon V5 based WCSS driver

Hi Vinod,

On 6/7/2018 2:13 PM, Vinod wrote:
> On 06-06-18, 21:24, Bjorn Andersson wrote:
>> On Wed 06 Jun 21:11 PDT 2018, Vinod wrote:
>>
>>> So, wouldn't Kconfig syntax something like where we say:
>>>         M if RPMSG_QCOM_GLINK_SMEM=m
>>>         bool if RPMSG_QCOM_GLINK_SMEM=y
>>>
>>
>> If we ignore SMD for a while we have the following combinations:
>>
>> glink/wcss
>> y     y - valid
>> y     m - valid
>> y     n - valid
>> m     y - link failure (invalid)
>> m     m - valid
>> m     n - valid
>> n     y - valid (platform uses wcss, but not glink)
>> n     m - valid (-----"-----)
>> n     n - valid
>>
>> So to distill this we have the two valid cases:
>> module/no if RPMSG_QCOM_GLINK_SMEM=m
>> yes/module/no if RPMSG_QCOM_GLINK_SMEM=y
>>
>> and the way you express that in Kconfig is the somewhat awkward
>>
>>   depends on RPMSG_QCOM_GLINK_SMEM || RPMSG_QCOM_GLINK_SMEM=n
> 
> Understood now :) Yes it is awkward..
> 
> Btw we seem to have issue with link fail here when glink is m and wcss
> is y. Why don't we see link fail for glink being n? Yes I understand that
> platform uses wcss but am curious how that works out :)
 
For glink being n, the stub functions gets linked, and not for glink=m.

Regards,
 Sricharan

-- 
"QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation

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